Root Cause Analysis

org.apache.commons.jelly.JellyTagException

jar:file:/srv/jenkins/plugins/urltrigger/WEB-INF/lib/urltrigger.jar!/org/jenkinsci/plugins/urltrigger/URLTriggerAction/index.jelly:28:62: <st:include> No page found 'sidepanel.jelly' for class org.jenkinsci.plugins.urltrigger.URLTrigger$InternalURLTriggerAction